Quote Originally Posted by becher View Post
Because a parallel hybrid works well in other racing applications.

The current spec system is hardly representative of what could be done with a parallel hybrid. It's as you said just a ad on like the WAE system in LMDh cars, but those cars are far from the be all and end all of what can be achieved.
You can't compare circuits with rallying. On circuits you have ideal conditions. You have very high level of recuperation and you don't need any spare energy because the energy consumption can be precisely calculated for the event. You can never achieve circuit recuperation levels in rallying. You always need much greater energy carried by the car because you have long road sections and much more variable total number of consummed energy per section. You also can't use that heavy batteries beause the cars themselves are in principle heavier. If you put Formula-E battery into the WRC car you get a car which is definitely slower than current WRC cars and quite likely also slower than Rally2. You simply can not built the rest of the car within 500 kg like you can do on circuit. See the E-tron which has 2 tons with what is basically a Formula-E battery.

Anyway my point stays. I fail to see why pushing for more compicated and more expensive option?